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Systems and methods for out-of-band interference mitigation

  • US 10,404,297 B2
  • Filed: 01/30/2019
  • Issued: 09/03/2019
  • Est. Priority Date: 12/16/2015
  • Status: Active Grant
First Claim
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1. A system for out-of-band interference mitigation comprising:

  • a transmit digital canceller, communicatively coupled to a digital transmit signal of a communication system, that samples and then transforms the digital transmit signal to create a first digital interference cancellation signal;

    wherein the transmit digital canceller transforms the digital transmit signal according to a first configuration state;

    wherein the digital transmit signal is ultimately upconverted by the communication system to a radio frequency (RF) transmit signal having a first RF carrier frequency in a transmit band;

    a first digital-to-analog-converter (DAC) that converts the first digital interference cancellation signal to a first baseband (BB) interference cancellation signal;

    a first frequency upconverter that converts the first BB interference cancellation signal to a first RF interference cancellation signal having the first RF carrier frequency in the transmit band;

    a first receive coupler, communicatively coupled to an RF receive signal of the communication system having a second RF carrier frequency in a receive band, that combines, in order to remove a first portion of interference in the transmit band, the first RF interference cancellation signal and the RF receive signal to generate a composite RF receive signal;

    wherein the composite RF receive signal is ultimately downconverted by the communication system to a composite digital receive signal;

    a sampling digital canceller, communicatively coupled to the digital transmit signal of the communication system, that samples and then transforms the digital transmit signal to create a second digital interference cancellation signal;

    wherein the sampling digital canceller transforms the digital transmit signal according to a second configuration state;

    a second DAC that converts the second digital interference cancellation signal to a second BB interference cancellation signal;

    a second frequency upconverter that converts the second BB interference cancellation signal to a second RF interference cancellation signal having the first RF carrier frequency in the transmit band;

    a cleaning coupler that combines, in order to remove interference in the transmit band, the RF transmit signal and the second RF interference cancellation signal to generate a cleaned RF transmit signal;

    a first frequency downconverter that converts the cleaned RF transmit signal to a cleaned BB transmit signal;

    a first analog-to-digital-converter (ADC) that converts the cleaned BB transmit signal to a cleaned digital transmit signal;

    a receive-band digital canceller that converts the cleaned digital transmit signal to a third digital interference cancellation signal;

    wherein the receive-band digital canceller transforms the cleaned digital transmit signal according to a third configuration state;

    wherein the third digital interference cancellation signal is combined with the composite digital receive signal in order to remove a second portion of interference in the receive band.

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